Wideband digital IFM receiver with frequency confirmation

摘要

An apparatus for confirming a frequency measurement of a received signal includes a discrete Fourier transform (DFT) module for receiving a sampled digital signal. The DFT module is configured to analyze the received sampled digital signal, and output amplitude values at different frequency components. A threshold comparator is included for receiving the amplitude values of the frequency components and outputting a thresholded-amplitude value exceeding a predetermined threshold value. A frequency confirmation is provided based on the thresholded-amplitude value. The sampled digital signal is sampled at a sampling frequency of f_s, and the DFT module is configured to analyze the received sampled digital signal at a frequency bandwidth that is equal to or less than f_s. The frequency bandwidth is equal to the sampling frequency of f_s, when the received sampled digital signal includes I and Q signals. The DFT module is configured to analyze the received sampled digital signal by examining N frequency components, where N equals the total number of frequency components equally spaced between 0 and the sampling frequency.